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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016334e5532e1d3984e033deb53976e7e19cdc2a59d00824ab6e98f36c03232d' 
  AND token = 'mbGY6/rtaPqCpcJFE+m0iYEj4T35CjJfQ5A2gd/+2WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}